#include<algorithm>
#include<fstream>
#include<iostream>
#include<iterator>
#include<ostream>
#include<string>
#include<vector>

void read(std::istream& in,std::vector<std::string>& text)
{
    std::string line;
    while (std::getline(in,line))
      text.push_back(line);
}


int main(int argc,char* argv[])
{
    std::vector<std::string> text;
    if (argc<2)
      read (std::cin,text);
    else
    {
	std::ifstream in(argv[1]);
	if(not in)
	{
	    std::perror(argv[1]);
	    return EXIT_FAILURE;
	}
	read(in,text);
    }

    std::sort(text.begin(),text.end());
    
    std::copy(text.begin(),text.end(),
	std::ostream_iterator<std::string>(std::cout,"\n"));
}
